South Korea has approved the basic plan for its first nuclear-powered submarine programme, clearing the way for a formal launch in 2027 and the first vessel to enter the water in the mid-2030s.

The decision

The Defence Acquisition Program Promotion Committee approved the basic acquisition strategy for the Jang Bogo N project at its 179th meeting on Friday. The project, also known as KSS-III Batch-III, was unveiled by Seoul in May and aims to develop and build nuclear-propelled, conventionally armed attack submarines at home. The government plans to select the submarine manufacturer through open bidding in the first half of next year and sign a formal contract by the end of 2027.

What the submarines will be

The name pairs Jang Bogo, the Navy's first submarine, with an N standing for next generation, nuclear power and new technology. At least three submarines of about 8,000 tonnes each are under consideration. Planning and Budget Minister Park Hong-keun estimated the programme at 28.9 trillion won, about $21.3 billion, in May, although the arms agency said the total budget has yet to be finalised. The programme was exempted from the standard feasibility study in August, a review that normally takes one to two years.

The fuel question remains open

Washington has given political consent for Seoul to build submarines powered by reactors using uranium enriched to below 20 per cent. But practical arrangements for the fuel remain unfinished: security talks opened in June, and a second round planned for July has not taken place. Hanwha Ocean and HD Hyundai Heavy Industries are expected to compete for the hull design and construction work. The arms agency said the submarines would strengthen deterrence against North Korea's nuclear and missile capabilities.